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[DWX,DWY]=<a href="%pathto:imop.vl_dwaffine;">VL_DWAFFINE</a>(X,Y) returns the derivative of the 2-D affine
warp [WX; WY] = [A T] [X; Y] with respect to the parameters A,T
computed at points X,Y.
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See also: <a href="%pathto:imop.vl_waffine;">VL_WAFFINE</a>(), <a href="%pathto:vl_help;">VL_HELP</a>().
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